A minimum flow circulation valve

Abstract

The utility model relates to the field of flow circulation valve discloses a minimum flow circulation valve, including the valve body, both sides of valve body all are fixedly connected with fixed pipe, the inside fixedly connected with shunt pipe no.

Description

Technical Field

[0001] This utility model relates to the field of flow circulation valves, and in particular to a minimum flow circulation valve. Background Technology

[0002] Minimum flow circulation valves are key devices in industry for protecting centrifugal pumps. When the flow rate is below the safety threshold, the bypass will automatically open to allow some fluid to flow back, ensuring that the total flow rate is within the safe range. This prevents the equipment from overheating, cavitation, and vibration due to insufficient flow. They are widely used in chemical, power and other fields and serve as a "protective barrier" to ensure the stable operation of pump equipment.

[0003] The minimum flow circulation valve consists of a valve body and bypass channel, valve core and valve seat, drive and control mechanism, sealing assembly and auxiliary connecting parts. The valve body and bypass channel are pressure-resistant shells with main and bypass passages, which serve as the basis for fluid diversion. The valve core and valve seat control the flow rate through the opening degree. The drive and control mechanism is divided into self-operated, electric and pneumatic types, which are driven by springs through pressure difference or motors in conjunction with signals, respectively, sensing changes and triggering actions. The sealing assembly includes O-rings to prevent leakage. The auxiliary connecting parts enable integration with the system pipeline.

[0004] Minimum flow circulation valves have limitations in practical applications due to their weak anti-clogging ability. Traditional throttling structures are easily clogged by particulate media, causing the valve core to jam. Especially in high viscosity media, frequent disassembly and cleaning maintenance are required, resulting in insufficient adaptability to complex working conditions and making it difficult to meet the modern industrial demand for high efficiency, low consumption, and easy maintenance.

[0005] Therefore, a minimum flow circulation valve is proposed to solve the above problems. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a minimum flow circulation valve, which aims to improve the existing technology where traditional throttling structures are easily blocked by particulate media, causing valve core jamming, requiring frequent disassembly and cleaning maintenance, resulting in insufficient adaptability under complex working conditions and difficulty in meeting the modern industrial demand for high efficiency, low consumption, and easy maintenance.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a minimum flow circulation valve, comprising a valve body, with fixed pipes fixedly connected to both sides of the valve body, a second diverter pipe fixedly connected inside the fixed pipe, a connecting pipe slidably connected to the outside of the second diverter pipe, a sliding pipe fixedly connected to the side of the connecting pipe away from the second diverter pipe, a fixed block fixedly connected to the outside of the sliding pipe, a housing fixedly connected to the outside of the sliding pipe, a pin slidably connected inside the housing, a spring sleeved on the outside of the pin, a fixed rod fixedly connected to the outside of the pin, and a handle fixedly connected to the side of the pin away from the housing.

[0008] As a further description of the above technical solution: a filter screen is slidably connected inside the connecting tube, activated carbon is slidably connected to the side of the filter screen away from the sliding tube, and a filter grid is slidably connected to the side of the activated carbon away from the filter screen.

[0009] As a further description of the above technical solution: the fixing rod is slidably connected inside the housing, and the side of the spring away from the handle is fixedly connected inside the housing.

[0010] As a further description of the above technical solution: the handle is slidably connected to the outside of the sliding tube.

[0011] As a further description of the above technical solution: the valve body is provided with a flow guide pipe 1, the side of the flow guide pipe 1 away from the flow divider pipe 2 is fixedly connected to the flow guide pipe 2, and the flow divider pipe 1 is fixedly connected inside the flow guide pipe 2.

[0012] As a further description of the above technical solution: the external part of the second diversion pipe is fixedly connected to the inside of the second guide pipe.

[0013] As a further description of the above technical solution: the pin is slidably connected inside the fixed block.

[0014] As a further description of the above technical solution: the pin is inserted into the inside of the connecting pipe.

[0015] This utility model has the following beneficial effects:

[0016] 1. After the fluid enters the valve body, it flows through the fixed pipes on both sides. When the flow rate is low, the second diversion pipe inside the fixed pipe guides part of the fluid into the circulation path to achieve the minimum flow circulation function. When the fluid flows through the connecting pipe, the filter screen, activated carbon and filter screen inside it intercept fine impurities, adsorb tiny impurities and odors in turn, to achieve step-by-step filtration and purification. These filter components can be easily disassembled and maintained due to the sliding connection. The connecting pipe is firmly connected to the second diversion pipe through the pin in the outer shell. When maintenance is required, the handle can be pulled to unlock the pin and separate the connecting pipe from the second diversion pipe. The whole system achieves minimum flow circulation control and fluid purification through the combination of diversion, filtration and convenient fixing and unlocking structure, while ensuring maintenance convenience.

[0017] 2. The valve body achieves automatic flow diversion through the cooperation of the guide pipe and the branch pipe. The large-diameter guide pipe 1 serves as a guide section before the circulation path, reducing resistance and ensuring that the fluid preferentially flows into the large-diameter branch pipe 2 at low flow rates, thus guaranteeing the flow rate of the circulation channel. The small-diameter guide pipe 2 connected to it forms a high-resistance flow channel, creating a resistance difference with the guide pipe 1. At low flow rates, the fluid automatically selects the large-diameter circulation path due to the high resistance of the small-diameter pipe. At high flow rates, the fluid's kinetic energy is sufficient to overcome the resistance of the small-diameter pipe, and it enters the branch pipe 1, which is the core of the main channel, through the guide pipe 2, achieving main flow. The branch pipe 2 is fixed inside the guide pipe 2, forming a dual-path parallel structure with the branch pipe 1. The entire process relies solely on the physical resistance difference between the large and small diameters to allow the fluid to automatically select its path, maintaining circulation at low flow rates and efficient flow at high flow rates. Attached Figure Description

[0018] Figure 1 A perspective view of a minimum flow circulation valve proposed in this utility model;

[0019] Figure 2 This is an enlarged view of Figure A;

[0020] Figure 3 This is a cross-sectional view of the housing of a minimum flow circulation valve proposed in this utility model;

[0021] Figure 4 This is an internal cross-sectional view of the connecting pipe of a minimum flow circulation valve proposed in this utility model;

[0022] Figure 5 This is a diagram showing the internal structure of the valve body of a minimum flow circulation valve proposed in this utility model.

[0023] Legend:

[0024] 1. Valve body; 2. Fixed pipe; 3. Connecting pipe; 4. Sliding pipe; 5. Fixing block; 6. Outer shell; 7. Handle; 8. Pin; 9. Spring; 10. Fixing rod; 11. Filter screen; 12. Activated carbon; 13. Filter grid; 14. Guide pipe one; 15. Guide pipe two; 16. Diverter pipe one; 17. Diverter pipe two. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figure 1 , Figure 2 , Figure 3This utility model provides an embodiment of a minimum flow circulation valve, comprising a valve body 1, with fixed pipes 2 fixedly connected to both sides of the valve body 1. The fixed pipes 2 extend the fluid passage. A second diverter pipe 17 is fixedly connected inside the fixed pipes 2, which diverts the fluid and may guide a portion of the fluid into the circulation path when the flow rate is low, thus achieving the minimum flow circulation function. A connecting pipe 3 is slidably connected to the outside of the second diverter pipe 17. The connecting pipe 3 is detachable and replaceable. A sliding pipe 4 is fixedly connected to the side of the connecting pipe 3 away from the second diverter pipe 17. The end of the connecting pipe 3 opposite to the second diverter pipe 17 is connected to... The sliding tube 4 is fixed as a whole. A fixing block 5 is fixedly connected to the outside of the sliding tube 4. The fixing block 5 is used to support other components and enhance the structural stability of the sliding tube 4. A shell 6 is fixedly connected to the outside of the sliding tube 4. The shell 6 is used to protect the internal pin 8 and spring 9 components, and at the same time provides installation space for these components. The pin 8 is slidably connected inside the shell 6. The pin 8 achieves "fixing" or "unlocking" of the connecting tube 3 by sliding, controlling the relative position of the connecting tube 3 and the diverter tube 17. A spring 9 is sleeved on the outside of the pin 8. The spring 9 provides elastic force so that the pin 8 remains "inserted" when there is no external force. In a "fixed" state, ensuring a secure connection between connecting pipe 3 and diverter pipe 17, a fixing rod 10 is fixedly connected to the outside of pin 8. The fixing rod 10 limits the sliding stroke of pin 8, preventing pin 8 from falling out of housing 6 and ensuring structural stability. A handle 7 is fixedly connected to the side of pin 8 away from housing 6, facilitating manual pulling of pin 8 for quick "unlocking" and improving maintenance convenience. The fixing rod 10 is slidably connected inside housing 6, providing guidance for the sliding of pin 8 and ensuring that pin 8 moves in a straight line, avoiding jamming. The handle 7 is slidably connected to the outside of sliding tube 4. 4 provides a sliding track for the handle 7 to ensure stability and accuracy during manual operation. The pin 8 is inserted into the inside of the connecting pipe 3. The relative position of the connecting pipe 3 and the diverter pipe 17 is fixed by the insertion to prevent the connection from loosening due to fluid impact during operation. The side of the spring 9 away from the handle 7 is fixedly connected to the inside of the housing 6. One end of the spring 9 is fixed so that it can stably provide elastic force to ensure that the pin 8 automatically resets after being released. The pin 8 is slidably connected to the inside of the fixing block 5. The fixing block 5 provides additional support and guidance for the pin 8 to ensure linear movement when the pin 8 is inserted or pulled out, thereby improving structural reliability.

[0027] Reference Figure 1 , Figure 4A filter screen 11 is slidably connected inside the connecting pipe 3. The filter screen 11 first intercepts large particulate impurities in the fluid, protecting the subsequent activated carbon 12 and filter grid 13. The sliding design facilitates maintenance. Activated carbon 12 is slidably connected to the side of the filter screen 11 away from the sliding pipe 4. The activated carbon 12 further adsorbs small impurities or odors in the fluid, improving the filtration accuracy. The sliding connection facilitates regular replacement. Filter grid 13 is slidably connected to the side of the activated carbon 12 away from the filter screen 11. Filter grid 13 is used to filter small impurities in the fluid. The sliding connection design facilitates disassembly, cleaning, or replacement.

[0028] Reference Figure 1 , Figure 5 The valve body 1 has an internal guide pipe 14, which serves as a pre-guide section for the high-flow circulation path, reducing fluid resistance and ensuring that the fluid can smoothly flow into the diverter pipe 17 at low flow rates, providing sufficient flow for the circulation channel. A guide pipe 15 is fixedly connected to the side of the guide pipe 14 furthest from the diverter pipe 17. The small diameter of the guide pipe 15 creates a high-resistance flow channel, forming a resistance difference with the large diameter of the guide pipe 14. At low flow rates, the fluid is more likely to flow through the large-diameter diverter pipe 17 due to the high resistance of the small diameter. At high flow rates, the fluid's kinetic energy is sufficient to overcome the resistance of the small diameter, and it preferentially flows through the diverter pipe 16, achieving automatic flow path selection. A diverter pipe 15 is fixedly connected internally to... Flow pipe 16, as the core of the main system channel, receives the small-diameter water flow guided by flow guide pipe 2 15. When the flow rate meets the standard, the high flow velocity characteristics brought by the small diameter allow the fluid to flow directly to the outlet of valve body 1, meeting the flow requirements of the main system. Flow guide pipe 2 17 is externally fixedly connected to the inside of flow guide pipe 2 15, forming a dual-path parallel structure with flow guide pipe 16. Flow guide pipe 2 17 is responsible for the circulation diversion when the flow rate is low, while flow guide pipe 1 16 is responsible for the main channel flow when the flow rate is high. Through the physical difference between the large and small diameters, no additional control components are needed. Automatic diversion is achieved solely by the fluid's tendency to lower resistance, ensuring uninterrupted circulation when the flow rate is low and efficient flow in the main channel when the flow rate is high.

[0029] Working principle: After the fluid enters the valve body 1, it flows through the fixed pipes 2 on both sides. When the flow rate is low, the diversion pipe 17 inside the fixed pipe 2 guides part of the fluid into the circulation path to achieve the minimum flow circulation function. When the fluid flows through the connecting pipe 3, the filter screen 13, activated carbon 12, and filter screen 11 inside it intercept fine impurities, adsorb tiny impurities and odors in turn, and achieve step-by-step filtration and purification. These filter components can be easily disassembled and maintained due to the sliding connection. The connecting pipe 3 is firmly connected to the diversion pipe 17 through the pin 8 inside the outer shell 6. When maintenance is required, the handle 7 can be pulled to unlock the pin 8, so that the connecting pipe 3 is separated from the diversion pipe 17. The whole system achieves minimum flow circulation control and fluid purification through the combination of diversion, filtration and convenient fixing and unlocking structure, while ensuring maintenance convenience.

[0030] The valve body 1 achieves automatic flow diversion through the cooperation of the guide pipe and the branch pipe. The large-diameter guide pipe 14 serves as a guide section before the circulation path, reducing resistance and ensuring that the fluid preferentially flows into the large-diameter branch pipe 17 when the flow rate is low, thus guaranteeing the flow rate of the circulation channel. The small-diameter guide pipe 15 connected to it forms a high-resistance flow channel, creating a resistance difference with the guide pipe 14. When the flow rate is low, the fluid automatically selects the large-diameter circulation path due to the high resistance of the small-diameter pipe. When the flow rate is high, the fluid kinetic energy is sufficient to overcome the resistance of the small-diameter pipe, and it enters the branch pipe 16, which is the core of the main channel, through the guide pipe 15, thus achieving main flow. The branch pipe 17 is fixed inside the guide pipe 15, forming a dual-path parallel structure with the branch pipe 16. The entire process relies solely on the physical resistance difference between the large and small diameters to allow the fluid to automatically select its path, maintaining circulation at low flow rates and efficient flow at high flow rates.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A minimum flow circulation valve, comprising a valve body (1), characterized in that: The valve body (1) is fixedly connected to both sides by a fixed pipe (2). A diversion pipe (17) is fixedly connected inside the fixed pipe (2). A connecting pipe (3) is slidably connected outside the diversion pipe (17). A sliding pipe (4) is fixedly connected to the side of the connecting pipe (3) away from the diversion pipe (17). A fixed block (5) is fixedly connected to the outside of the sliding pipe (4). A shell (6) is fixedly connected to the outside of the sliding pipe (4). A pin (8) is slidably connected inside the shell (6). A spring (9) is sleeved on the outside of the pin (8). A fixed rod (10) is fixedly connected to the outside of the pin (8). A handle (7) is fixedly connected to the side of the pin (8) away from the shell (6).

2. The minimum flow circulation valve according to claim 1, characterized in that: A filter screen (11) is slidably connected inside the connecting pipe (3). Activated carbon (12) is slidably connected to the side of the filter screen (11) away from the sliding pipe (4). A filter grid (13) is slidably connected to the side of the activated carbon (12) away from the filter screen (11).

3. The minimum flow circulation valve according to claim 1, characterized in that: The fixing rod (10) is slidably connected inside the housing (6), and the spring (9) is fixedly connected inside the housing (6) on the side away from the handle (7).

4. The minimum flow circulation valve according to claim 1, characterized in that: The handle (7) is slidably connected to the outside of the sliding tube (4).

5. A minimum flow circulation valve according to claim 4, characterized in that: The valve body (1) is provided with a flow guide pipe (14) inside. The flow guide pipe (14) is fixedly connected to the side away from the diversion pipe (17) with a flow guide pipe (15). The flow guide pipe (15) is fixedly connected to the inside with a diversion pipe (16).

6. A minimum flow circulation valve according to claim 5, characterized in that: The outside of the second diversion pipe (17) is fixedly connected to the inside of the second diversion pipe (15).

7. A minimum flow circulation valve according to claim 1, characterized in that: The pin (8) is slidably connected inside the fixed block (5).

8. A minimum flow circulation valve according to claim 1, characterized in that: The pin (8) is inserted into the inside of the connecting tube (3).

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